Staining on Stone From a faulty Boiler

Darren75 · Jun 14, 2021

Hey all,

I have just had a customer ask me to price up a job, I'm, not sure what to use to get the stain off, it is from a faulty boiler.

View attachment Staining.pdf

AW Services · Jun 14, 2021

Darren75 said:
Hey all,

I have just had a customer ask me to price up a job, I'm, not sure what to use to get the stain off, it is from a faulty boiler.

View attachment 24948

Most stains from old boilers are iron deposits from the cast iron heat exchanger etc.

They can be tricky to remove from porous stone. A good brick acid such as patio and pathway cleaner are good or SH diluted

Pjj · Jun 14, 2021

Looks like black mould rather than rust deposits if it is then a hypo mix will remove it if it’s rusty water marks then oxalic acid will remove it .

Darren75 · Jun 14, 2021

Thanks for your input lads, I let the customer know it's not something I can do. I would need a an extendable pole, and pump for that, I'm guessing the whole side would need doing or it would look too clean, where I had softwashed.

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Staining on Stone From a faulty Boiler

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